Calcium and Lipid Metabolism - Full Text View

Purpose

We hope to determine if supplementing the diet of women who habitually consume low levels of calcium, with 1500 mg of calcium a day for three months will increase fat oxidation and decrease fat storage. We will also measure concentrations of lipids, glucose, hormones and enzymes associated with fat and carbohydrate metabolism to determine alterations and mechanism of the metabolic changes.

Condition	Intervention
Obesity	Dietary Supplement: Calcium Carbonate

MedlinePlus related topics:

Dietary Supplements Obesity

ChemIDplus related topics:

Calcium gluconate Calcium carbonate Lipids

U.S. FDA Resources

Study Type:	Interventional
Study Design:	Prevention, Open Label, Uncontrolled, Single Group Assignment

Official Title:	The Effects of Calcium Supplementation on Adipocyte Metabolism in Overweight Women

Further study details as provided by USDA, Western Human Nutrition Research Center:

Primary Outcome Measures:

Lipolysis by infusion of stable isotopes of 1,1,2,3,3-[2H5] glycerol [ Time Frame: 0 and 3 months ] [ Designated as safety issue: No ]

Secondary Outcome Measures:

Hepatic glucose production by infusion of stable isotopes of 6,6-[2H2] glucose [ Time Frame: 0 and 3 months ] [ Designated as safety issue: No ]
Lipogenesis by measurement of fatty acid synthase activity (14C radiochemical assay) , mRNA expression ( Real Time Polymerase Chain Reaction) and protein content (ELISA) [ Time Frame: 0 and 3 months ] [ Designated as safety issue: No ]
Indirect calorimetry measurement of non-protein respiratory quotient (NPRQ), energy expenditure, fat and carbohydrate oxidation [ Time Frame: 0 and 3 months ] [ Designated as safety issue: No ]
Serum calcium, glucose, cholesterol, triglycerides, LDL, HDL, parathyroid hormone, leptin, free fatty acids, adiponectin, 1,25(OH)2D, 25(OH)D [ Time Frame: 0 and 3 months ] [ Designated as safety issue: No ]
urinary calcium and sodium excretion [ Time Frame: 0 and 3 months ] [ Designated as safety issue: No ]

Enrollment:	15
Study Start Date:	September 2001
Study Completion Date:	July 2002
Primary Completion Date:	July 2002 (Final data collection date for primary outcome measure)

Intervention Details:

1500 mg per day

Detailed Description:

The incidence of obesity has rapidly increased in recent years and reached epidemic proportions in the United States. Recent epidemiological data has shown an inverse relationship between calcium intake and body fat and emerging research suggests that inadequate dietary calcium consumption may increase obesity. Studies in mice have shown that an increase in dietary calcium consumption creates a shift in the utilization of energy stores from carbohydrates to fat and a shift in the partitioning of energy from storage (as fat) to expenditure (as heat).

We will give 1500 mg of calcium a day for three months to women who habitually consume low levels of dietary calcium. The following measurements will be made before and after calcium supplementation: body fat by DEXA, lipolysis by infusion of stable isotopes of 1,1,2,3,3-[2H5] glycerol , hepatic glucose production by infusion of stable isotopes of 6,6-[2H2] glucose, lipogenesis by measurement of fatty acid synthase activity (14C radiochemical assay) , mRNA expression ( Real Time Polymerase Chain Reaction) and protein content (ELISA), indirect calorimetry measurement of non-protein respiratory quotient (NPRQ), energy expenditure, fat and carbohydrate oxidation. Serum calcium, glucose, cholesterol, triglycerides, LDL, HDL, parathyroid hormone, leptin, free fatty acids, adiponectin, 1,25(OH)2D, 25(OH)D and urinary calcium excretion will also be measured.

Eligibility

Ages Eligible for Study:	20 Years to 40 Years
Genders Eligible for Study:	Female
Accepts Healthy Volunteers:	Yes

Criteria

Inclusion Criteria:

BMI between 25 and 30 kg/m2
Taking oral contraceptives
Having regular menses

Exclusion Criteria:

Pregnant
History of metabolic bone, renal or thyroid disease,
History of diabetes mellitus, or gestational diabetes mellitus
Cigarette smoking
Self-administration of calcium supplements
Regular aerobic activity, i.e. jogging > 1 mile/day

Contacts and Locations

Please refer to this study by its ClinicalTrials.gov identifier: NCT00686192

Locations


United States, California
	San Francisco General Hospital
	San Francisco, California, United States, 94110

Sponsors and Collaborators

USDA, Western Human Nutrition Research Center

University of California, Davis

San Francisco General Hospital

Investigators


Principal Investigator:	Janet C King, PhD	Children's Hospital Oakland Research Institute

More Information

USDA Western Human Nutrition Research Center This link exits the ClinicalTrials.gov site

Responsible Party:	Children's Hospital Oakland Research Institute ( Janet C. King, PhD )
Study ID Numbers:	WHNRC001
First Received:	May 27, 2008
Last Updated:	July 21, 2008
ClinicalTrials.gov Identifier:	NCT00686192
Health Authority:	United States: Federal Government

Keywords provided by USDA, Western Human Nutrition Research Center:

Obesity

Calcium carbonate

Dietary Supplements

Lipolysis

Study placed in the following topic categories:

Body Weight

Signs and Symptoms

Obesity

Nutrition Disorders

Overnutrition

Overweight

Calcium Carbonate

Additional relevant MeSH terms:

Molecular Mechanisms of Pharmacological Action

Antacids

Pharmacologic Actions

ClinicalTrials.gov processed this record on August 29, 2008

Sponsors and Collaborators:	USDA, Western Human Nutrition Research Center University of California, Davis San Francisco General Hospital
Information provided by:	USDA, Western Human Nutrition Research Center
ClinicalTrials.gov Identifier:	NCT00686192